In my cassandra logs, I see a lot of "StatusLogger" output lines. I'm trying to understand why this is logged, and how to interpret the output. Maybe someone can point me to some documentation on this particular logging aspect?

I would like to know what is triggering the StatusLogger.java to start logging? Sometimes it logs every few seconds, and sometimes it won't log for hours.

Also, about the lines that log "Memtable ops, data" per ColumnFamily, what do these figures mean? Is it number of operations and data size (bytes, MB, ...)? Are the ops counters reset every time they are logged, or e.g. every x minutes?

Any help is greatly appreciated!